Geodesic
On the problem of reducibility of systems of linear differential equations with quasiperiodic coefficients
Izvestiya. Mathematics , Tome 1 (1967) no. 2, pp. 335-340

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It is shown herein that there are irreducible systems among those with quasiperiodic analytic coefficients whose frequencies are algebraic numbers. 
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     author = {I. N. Blinov},
     title = {On the problem of reducibility of systems of linear differential equations with quasiperiodic coefficients},
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I. N. Blinov. On the problem of reducibility of systems of linear differential equations with quasiperiodic coefficients. Izvestiya. Mathematics , Tome 1 (1967) no. 2, pp. 335-340. http://geodesic.mathdoc.fr/item/IM2_1967_1_2_a7/